概览

优势和特点

  • Measures Up to 15 Battery Cells in Series
  • 2.2mV Maximum Total Measurement Error
  • Stackable Architecture Supports 100s of Cells
  • Built-In isoSPI Interface
    • 1Mb Isolated Serial Communications
    • Uses a Single Twisted Pair, Up to 100 Meters
    • Low EMI Susceptibility and Emissions
    • Bidirectional for Broken Wire Protection
  • 245µs to Measure All Cells in a System
  • Synchronized Voltage and Current Measurement
  • 16-Bit Delta-Sigma ADC with Programmable 3rd Order Noise Filter
  • Engineered for ISO 26262-Compliant Systems
  • Passive Cell Balancing Up to 200mA (Max) with Programmable Pulse-Width Modulation
  • 9 General Purpose Digital I/O or Analog Inputs
    • Temperature or Other Sensor Inputs
    • Configurable as an I2C or SPI Master
  • 6µA Sleep Mode Supply Current
  • 64-Lead eLQFP Package

产品详情

The LTC6812-1 is a multicell battery stack monitor that measures up to 15 series connected battery cells with a total measurement error of less than 2.2mV. The cell measurement range of 0V to 5V makes the LTC6812-1 suitable for most battery chemistries. All 15 cells can be measured in 245µs, and lower data acquisition rates can be selected for high noise reduction.

Multiple LTC6812-1 devices can be connected in series, permitting simultaneous cell monitoring of long, high voltage battery strings. Each LTC6812-1 has an isoSPI interface for high speed, RF immune, long distance communications. Multiple devices are connected in a daisy chain with one host processor connection for all devices. This daisy chain can be operated bidirectionally, ensuring communication integrity, even in the event of a fault along the communication path.

The LTC6812-1 can be powered directly from the battery stack or from an isolated supply. The LTC6812-1 includes passive balancing for each cell, with individual PWM duty cycle control for each cell. Other features include an onboard 5V regulator, nine general purpose I/O lines and a sleep mode, where current consumption is reduced to 6µA.

Applications

  • Electric and Hybrid Electric Vehicles
  • Backup Battery Systems
  • Grid Energy Storage
  • High Power Portable Equipment

产品生命周期 icon-recommended 量产

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